I used to have an iPhone 5 which I updated to iOS 7 & then iOS 7.1.1 which I did straight away as soon as I got the phone. The phone turned out to be second hand used and was replaced by Apple Store under UK consumer law, there was a fault with the phone that I found out it was used, when the home button stopped working, but at the same time I had severe battery drain issues, where the battery would be completely drained in 20 minutes and even the aid of a Mophie battery case the battery was dead in 3 hours so I even got a DNS power pack too.
I now have a new iPhone 5 on iOS 6, the battery performance is not great either, to test it, I used the screen at full brightness & never turn off, location services turned on and currently have 4 hours. 46 minutes of usage with 7 hours of standby.
So I do not want to ruin another iPhone, is iOS 7.1.1 safe to upgrade to? Or is it best to wait for iOS 8? And do current iOS 8 users on beta program have any issues with battery performance yet?
I really liked iOS 7 and iOS 8 looks really good from the demonstrations I have seen, but really do not want a poorly performing battery